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A nickel-toughened high-chromium cast iron type self-shielded surfacing flux-cored wire and its preparation method

A high-chromium cast iron, self-protection technology, used in welding equipment, welding media, manufacturing tools, etc., can solve the problems of inability to guarantee wear resistance, decrease in hardness of surfacing alloys, etc., achieve good welding process performance, and improve crack resistance. The obvious effect of toughening and toughening of alloy structure

Active Publication Date: 2018-04-06
JIANGSU YONGHAO HIGH STRENGTH BOLT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The method of reducing the content of C and alloying elements is usually used to transform the high-chromium cast iron type surfacing alloy from hypereutectic structure to hypoeutectic structure in order to obtain sufficient toughness; however, reducing the content of C and alloying elements will lead to The hardness is obviously reduced, and the wear resistance cannot be guaranteed

Method used

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  • A nickel-toughened high-chromium cast iron type self-shielded surfacing flux-cored wire and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A nickel-toughened high-chromium cast iron type self-shielding surfacing flux-cored welding wire, including a low-carbon steel strip and a flux core, the flux core is filled in the steel strip, and the composition of the flux core is prepared according to the following quality: 55g of 80-mesh high-carbon chromium Iron, 24g of 80 mesh nickel powder, 0.5g of 60 mesh graphite, 1.5g of 200 mesh graphite, 1g of 60 mesh iron boron, 2g of 200 mesh iron boron, 1g of 60 mesh aluminum magnesium alloy, 1g of 200 mesh aluminum Magnesium alloy, 2g of 60 mesh manganese powder, 1g of 200 mesh manganese powder, 11g of iron powder. Put the various powders taken into the powder mixer, mix for 40 minutes, then add the mixed powder into the U-shaped 21×0.5mm H08A carbon steel belt groove, and the filling rate is 50%. Then close the U-shaped groove so that the powder is wrapped therein. Then make it pass through one or more of the wire drawing dies with diameters of 4.2mm, 3.8mm, 3.5mm, 3....

Embodiment 2

[0031] A nickel-toughened high-chromium cast iron type self-shielding surfacing flux-cored welding wire, including a low-carbon steel strip and a flux core, the flux core is filled in the steel strip, and the composition of the flux core is prepared according to the following quality: 65g of 80-mesh high-carbon chromium Iron, 16g of 80 mesh nickel powder, 1g of 60 mesh graphite, 1g of 200 mesh graphite, 5g of 60 mesh iron boron, 1g of 200 mesh iron boron, 2g of 60 mesh aluminum magnesium alloy, 1.5g of 200 mesh aluminum magnesium Alloy, 1.5g of 60 mesh manganese powder, 2g of 200 mesh manganese powder, 4g of iron powder. The various powders taken are put into the powder mixer, mixed for 40 minutes, and then the mixed powder is added into the U-shaped 21×0.5mm H08A carbon steel belt groove, and the filling rate is 56%. Then close the U-shaped groove so that the powder is wrapped therein. Then make it pass through one or more of the wire drawing dies with diameters of 4.2mm, 3....

Embodiment 3

[0033]A nickel-toughened high-chromium cast iron type self-shielding surfacing flux-cored welding wire, including a low-carbon steel strip and a flux core, the flux core is filled in the steel strip, and the composition of the flux core is prepared according to the following quality: 58g of 80-mesh high-carbon chromium Iron, 19g of 80 mesh nickel powder, 0.6g of 60 mesh graphite, 2g of 200 mesh graphite, 2g of 60 mesh iron boron, 3g of 200 mesh iron boron, 1.4g of 60 mesh aluminum magnesium alloy, 1g of 200 mesh aluminum Magnesium alloy, 1g of 60 mesh manganese powder, 3g of 200 mesh manganese powder, 9g of iron powder. The various powders taken are put into the powder mixer, mixed for 40 minutes, and then the mixed powder is added into the U-shaped 21×0.5mm H08A carbon steel belt groove, and the filling rate is 52%. Then close the U-shaped groove so that the powder is wrapped therein. Then make it pass through one or more of the wire drawing dies with diameters of 4.2mm, 3.8...

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Abstract

The invention discloses a nickel toughening high-chromium cast iron self-protection overlaying flux-cored wire. The flux-cored wire uses a low-carbon steel strip as a cover, and comprises the following flux-cored components in percentage by mass: 55-65% of high carbon ferrochrome, 16-24% of nickel powder, 0.5-1% of 60-mesh graphite, 1-2% of 200-mesh graphite, 1-5% of 60-mesh ferroboron, 1-3% of 200-mesh ferroboron, 1-2% of 60-mesh aluminum magnesium alloy, 1-2% of 200-mesh aluminum magnesium alloy, 1-2% of 60-mesh manganese powder, 1-3% of 200-mesh manganese powder, and the balance iron powder; and the flux-cored powder is 50-56% of the total weight of the flux-cored wire. The flux-cored components with different particle sizes are added to the flux-cored wire to guarantee excellent welding process performance, and a proper amount of Ni is added in the flux-cored components to urge increment of austenite number in an overlaying alloy high-chromium cast iron hypereutectic structure matrix; and meanwhile, the solid solution strengthening effect of the matrix is obvious, an overlaying alloy is effectively toughened, the crack resistance is greatly improved, the welding process performance is excellent, the cladding efficiency is high, and the multilayer welding needs no slag removal.

Description

technical field [0001] The invention belongs to the field of welding in material processing engineering, and in particular relates to a nickel-toughened high-chromium cast iron type self-protection surfacing flux-cored welding wire and a preparation method thereof. Background technique [0002] As a green manufacturing process, surfacing welding is widely used in the repair or remanufacture of various wear-resistant parts. Due to low cost and easy preparation, M 7 C 3 Type carbides (M=Cr, Fe) are widely used as high-chromium cast iron surfacing alloys with wear-resistant skeletons. Coarse M in hypereutectic structure of high chromium cast iron surfacing alloy 7 C 3 Type carbide, on the one hand, is beneficial to improve wear resistance, on the other hand, it is prone to metallurgical defects and microcracks, and is very brittle, which becomes an important reason why surfacing alloys develop into macrocracks or even cracks during service. . Therefore, overcoming the def...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30B23K35/368B23K35/40
CPCB23K35/0266B23K35/3086B23K35/3601B23K35/368B23K35/406
Inventor 刘大双吴铭方魏萍祁凯石铭霄
Owner JIANGSU YONGHAO HIGH STRENGTH BOLT
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